Removal of phosphate and fluoride from optoelectronic wastewater by calcite

Ekaterina K. Gunawan; Warmadewanthi; J. C. Liu

doi:10.1504/IJETM.2010.031535

Removal of phosphate and fluoride from optoelectronic wastewater by calcite

Ekaterina K. Gunawan, Warmadewanthi, J. C. Liu

National Taiwan University of Science and Technology

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

Abstract

The objective of this study is to study the removal of phosphate (PO ₄^3-) and fluoride (F^-) by using calcite from the thin-film transistor liquid crystal display (TFT-LCD) manufacturing wastewater. The highest phosphate adsorption capacity of 40.65 mg/g calcite was found at pH 6.5. It is proposed that both adsorption and precipitation were involved in the removal of phosphate and fluoride. Solid characterisation inferred the evidence of calcium phosphate precipitations, mainly brushite (CaHPO₄ · 2H₂O) and HAP (Ca₁₀(PO ₄)₆(OH)₂) at pH around 5. The presence of fluoride tends to inhibit the removal of phosphate. Fluoride removal, as high as 85.2%, was obtained at pH 6.5 and calcite dosage of 10 g/L, and the main mechanism was through fluorite (CaF₂) precipitation, and adsorption onto brushite and HAP. Results show that calcite is an effective adsorbent for phosphate and fluoride removal from TFT-LCD wastewater.

Original language	English
Pages (from-to)	308-321
Number of pages	14
Journal	International Journal of Environmental Technology and Management
Volume	12
Issue number	2-4
DOIs	https://doi.org/10.1504/IJETM.2010.031535
Publication status	Published - Feb 2010
Externally published	Yes

Keywords

Adsorption
Calcite
Fluoride
Optoelectronic
Phosphate
TFT-LCD
Wastewater

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title = "Removal of phosphate and fluoride from optoelectronic wastewater by calcite",

abstract = "The objective of this study is to study the removal of phosphate (PO 43-) and fluoride (F-) by using calcite from the thin-film transistor liquid crystal display (TFT-LCD) manufacturing wastewater. The highest phosphate adsorption capacity of 40.65 mg/g calcite was found at pH 6.5. It is proposed that both adsorption and precipitation were involved in the removal of phosphate and fluoride. Solid characterisation inferred the evidence of calcium phosphate precipitations, mainly brushite (CaHPO4 · 2H2O) and HAP (Ca10(PO 4)6(OH)2) at pH around 5. The presence of fluoride tends to inhibit the removal of phosphate. Fluoride removal, as high as 85.2%, was obtained at pH 6.5 and calcite dosage of 10 g/L, and the main mechanism was through fluorite (CaF2) precipitation, and adsorption onto brushite and HAP. Results show that calcite is an effective adsorbent for phosphate and fluoride removal from TFT-LCD wastewater.",

keywords = "Adsorption, Calcite, Fluoride, Optoelectronic, Phosphate, TFT-LCD, Wastewater",

author = "Gunawan, {Ekaterina K.} and Warmadewanthi and Liu, {J. C.}",

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AU - Gunawan, Ekaterina K.

AU - Warmadewanthi,

AU - Liu, J. C.

PY - 2010/2

Y1 - 2010/2

N2 - The objective of this study is to study the removal of phosphate (PO 43-) and fluoride (F-) by using calcite from the thin-film transistor liquid crystal display (TFT-LCD) manufacturing wastewater. The highest phosphate adsorption capacity of 40.65 mg/g calcite was found at pH 6.5. It is proposed that both adsorption and precipitation were involved in the removal of phosphate and fluoride. Solid characterisation inferred the evidence of calcium phosphate precipitations, mainly brushite (CaHPO4 · 2H2O) and HAP (Ca10(PO 4)6(OH)2) at pH around 5. The presence of fluoride tends to inhibit the removal of phosphate. Fluoride removal, as high as 85.2%, was obtained at pH 6.5 and calcite dosage of 10 g/L, and the main mechanism was through fluorite (CaF2) precipitation, and adsorption onto brushite and HAP. Results show that calcite is an effective adsorbent for phosphate and fluoride removal from TFT-LCD wastewater.

AB - The objective of this study is to study the removal of phosphate (PO 43-) and fluoride (F-) by using calcite from the thin-film transistor liquid crystal display (TFT-LCD) manufacturing wastewater. The highest phosphate adsorption capacity of 40.65 mg/g calcite was found at pH 6.5. It is proposed that both adsorption and precipitation were involved in the removal of phosphate and fluoride. Solid characterisation inferred the evidence of calcium phosphate precipitations, mainly brushite (CaHPO4 · 2H2O) and HAP (Ca10(PO 4)6(OH)2) at pH around 5. The presence of fluoride tends to inhibit the removal of phosphate. Fluoride removal, as high as 85.2%, was obtained at pH 6.5 and calcite dosage of 10 g/L, and the main mechanism was through fluorite (CaF2) precipitation, and adsorption onto brushite and HAP. Results show that calcite is an effective adsorbent for phosphate and fluoride removal from TFT-LCD wastewater.

KW - Adsorption

KW - Calcite

KW - Fluoride

KW - Optoelectronic

KW - Phosphate

KW - TFT-LCD

KW - Wastewater

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DO - 10.1504/IJETM.2010.031535

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SN - 1466-2132

VL - 12

SP - 308

EP - 321

JO - International Journal of Environmental Technology and Management

JF - International Journal of Environmental Technology and Management

IS - 2-4

ER -

Removal of phosphate and fluoride from optoelectronic wastewater by calcite

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Keywords

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